setActiveSheetIndex(0) ->setTitle('Test1') ->setCellValue('D1', 1) ->setCellValue('D2', 2) ->setCellValue('D3', 3) ->setCellValue('D4', 4) ->setCellValue('D5', '=SUM(D1:D4)') ->setSelectedCell('B2'); $spreadsheet->createSheet(1); $spreadsheet->setActiveSheetIndex(1) ->setTitle('Test2') ->setCellValue('D1', 4) ->setCellValue('E1', 3) ->setCellValue('F1', 2) ->setCellValue('G1', 1) ->setCellValue('H1', '=SUM(D1:G4)') ->setSelectedCells('A1:B2'); $spreadsheet->createSheet(2); $spreadsheet->setActiveSheetIndex(2) ->setTitle('Test3') ->setCellValue('A1', 4) ->setCellValue('B1', 3) ->setCellValue('C1', 2) ->setCellValue('D1', 1) ->setCellValue('E1', '=SUM(A1:D4)') ->setSelectedCells('A1:D1'); $spreadsheet->setActiveSheetIndex(1); $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, $format); // Original object. self::assertSame(1, $spreadsheet->getActiveSheetIndex()); // Saved and reloaded file. self::assertSame(1, $reloadedSpreadsheet->getActiveSheetIndex()); } }